# eth_getFilterChanges - Ethereum

Polling method for a filter, which returns an array of logs which occurred since last poll.

# Parameters

QUANTITY - The filter id.

```json
params: ["0xfe704947a3cd3ca12541458a4321c869"];
```

***

# Returns

Array - Array of log objects, or an empty array if nothing has changed since last poll.

> **NOTE:** eth\_getFilterChanges only returns logs since the filter was created, regardless of the block passed in to create the filter. To get logs ranging from a specific block you should use [eth\_getLogs](https://unifra.readme.io/reference/eth_getlogs) .

* For filters created with eth\_newBlockFilter the return are block hashes (DATA, 32 Bytes), e.g. \["0x3454645634534..."].
* For filters created with eth\_newPendingTransactionFilter the return are transaction hashes (DATA, 32 Bytes), e.g. \["0x6345343454645..."].
* For filters created with eth\_newFilter logs are objects with following params:
  * removed: TAG - True when the log was removed, due to a chain reorganization. False if its a valid log.
  * logIndex: QUANTITY - Integer of the log index position in the block. Null when its pending log.
  * transactionIndex: QUANTITY - Integer of the transactions index position log was created from. Null when its pending log.
  * transactionHash: DATA, 32 Bytes - Hash of the transactions this log was created from. Null when its pending log.
  * blockHash: DATA, 32 Bytes - Hash of the block where this log was in. Null when its pending. Null when its pending log.
  * blockNumber: QUANTITY - The block number where this log was in. Null when its pending. Null when its pending log.
  * address: DATA, 20 Bytes - Address from which this log originated.
  * data: DATA - Contains one or more 32 Bytes non-indexed arguments of the log.
  * topics: Array of DATA - Array of 0 to 4 32 Bytes DATA of indexed log arguments.
    * In solidity: The first topic is the hash of the signature of the event (e.g. Deposit(address,bytes32,uint256)), except you declare the event with the anonymous specifier.

***

# Example

## Request

```curl
curl https://eth-mainnet.unifra.io/v1/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getFilterChanges","params":["0xfe704947a3cd3ca12541458a4321c869"],"id":73}'
```
```Text Postman
URL: https://eth-mainnet.unifra.io/v1/your-api-key
RequestType: POST
Body:
{
    "jsonrpc":"2.0",
    "method":"eth_getFilterChanges",
    "params":["0xfe704947a3cd3ca12541458a4321c869"],
    "id":73
}
```

## Result

```json
{
    "jsonrpc": "2.0",
    "id": 73,
    "result": [{
        "address": "0xb5a5f22694352c15b00323844ad545abb2b11028",
        "blockHash": "0x99e8663c7b6d8bba3c7627a17d774238eae3e793dee30008debb2699666657de",
        "blockNumber": "0x5d12ab",
        "data": "0x0000000000000000000000000000000000000000000000a247d7a2955b61d000",
        "logIndex": "0x0",
        "removed": false,
        "topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef", "0x000000000000000000000000bdc0afe57b8e9468aa95396da2ab2063e595f37e", "0x0000000000000000000000007503e090dc2b64a88f034fb45e247cbd82b8741e"],
        "transactionHash": "0xa74c2432c9cf7dbb875a385a2411fd8f13ca9ec12216864b1a1ead3c99de99cd",
        "transactionIndex": "0x3"
    }, {
        "address": "0xe38165c9f6deb144afc9c32c206b024817e1496d",
        "blockHash": "0x99e8663c7b6d8bba3c7627a17d774238eae3e793dee30008debb2699666657de",
        "blockNumber": "0x5d12ab",
        "data": "0x0000000000000000000000000000000000000000000000000000000025c6b720",
        "logIndex": "0x3",
        "removed": false,
        "topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef", "0x00000000000000000000000080e73e47173b2d00b531bf83bc39e710157125c3", "0x0000000000000000000000008f6cc93795969e5bbbf07c66dfee7d41ad24f1ef"],
        "transactionHash": "0x9e8f1cb1facb9a11a1cf947634053a0b2d557399f926b12127aa10497a2f0153",
        "transactionIndex": "0x5"
    }
}
```

# OpenAPI definition

```json
{
  "openapi": "3.1.0",
  "info": {
    "title": "ethereum-api",
    "version": "1.0"
  },
  "servers": [
    {
      "url": "https://eth-mainnet.unifra.io/v1"
    }
  ],
  "security": [
    {}
  ],
  "paths": {
    "/{your-api-key}": {
      "post": {
        "summary": "web3_sha3 - Ethereum",
        "description": "Returns Keccak-256 (not the standardized SHA3-256) of the given data.",
        "operationId": "web3_sha3",
        "parameters": [
          {
            "name": "your-api-key",
            "in": "path",
            "schema": {
              "type": "string"
            },
            "required": true
          }
        ],
        "requestBody": {
          "content": {
            "application/json": {
              "schema": {
                "type": "object",
                "properties": {
                  "jsonrpc": {
                    "type": "string",
                    "default": "2.0"
                  },
                  "method": {
                    "type": "string",
                    "default": "web3_sha3"
                  },
                  "params": {
                    "type": "array",
                    "items": {
                      "type": "string"
                    }
                  },
                  "id": {
                    "type": "integer",
                    "default": 0,
                    "format": "int32"
                  }
                }
              }
            }
          }
        },
        "responses": {
          "200": {
            "description": "200",
            "content": {
              "application/json": {
                "examples": {
                  "Result": {
                    "value": "{}"
                  }
                },
                "schema": {
                  "type": "object",
                  "properties": {}
                }
              }
            }
          },
          "400": {
            "description": "400",
            "content": {
              "application/json": {
                "examples": {
                  "Result": {
                    "value": "{}"
                  }
                },
                "schema": {
                  "type": "object",
                  "properties": {}
                }
              }
            }
          }
        },
        "deprecated": false
      }
    }
  },
  "x-readme": {
    "headers": [],
    "explorer-enabled": true,
    "proxy-enabled": true
  },
  "x-readme-fauxas": true
}
```